Computing machine



Sept. 11, 1934.

Filed July l0, 1931 F. A. HART COMPUTING MACHINE 8 Sheets-Sheet 2 Sept. l1, 1934. F,`A. HART COMPUTING MACHINE Filed July l0, 1931 8 SheetS-Sheeb 3 INVENTOR @f WITNESSES Sept. 11, 1934. F. A. HART 1,973,313

COMPUTING MACHINE Filed July 10, 1951 8 Sheets-Sheet 4 VVITNESSES INVENTOR ATTORNEY sept. 11, 1934. E A HART 1,973,313.l

COMPUTING MACHINE Filed July l0, 1951 8 Sheets-Sheet 5 ATTORNEY Sept. l L F' A, HART COMPUTING MACHINE Filed July lO 1931 8 Sheets-Sheet 6 mmm, mmm

jaw/f if/m ATTO RN EY Sept. 1l, 1934. F, A. HART COMPUTING MACHINE Filed July lO. 1951. 8 Sheets-Sheet 7 WlTNESSES )NVENTOR Y AT T G R N EY Sept. n, 1934,. F A HART 1,973,313

COMPUTING MACHINE Filed July lO, 1931 8 Sheets-Sheet 8 WITNESSES INVENTOR ATTORNEY Patented Sept. 11, 1934 CDPUTIN'G MACHINE Frederick A. Hart, New Britain, Comi., assignor vto Remington Typewriter Company,

N. Y., a corporation of New York Application July 10,1931, serial No. 549,852

59 Claims.

My invention relates to computing and like machines and to combined typewriting and comput-V ing machines and is directed more particularly to automatically controlled locking means for such machines to prevent false or improper operation thereof under varying conditions of use.

One of the main objects of my invention, generally stated, is to provide comparatively simple locking means of the character specified that are reliable and highly eicient in use andA do not appreciably slow up the high rate of speed at which the machine is capable of being operated.

Another object of my invention is to provide improved key locking means controlled by individually operable power actuated elements by which the computing or computing and printing instrumentalities are operated or controlled, and thereby insure the complete cycling of a power actuated `element when it is once set in motion before another key can be depressed.

A further object of said invention is to provide improved means for automatically locking the keys of the computing mechanism against operation when the switch by which the motor for actuating said power operated elements is shifted to cut oil the power to the motor.

A still further objectof my invention is to provide improved means by which the keys that initiate the operation of the computing mech- 30 anism 'are automatically locked against operation when the tabulator mechanism is actuated.

A further object of the invention is to provide improved means for automatically locking the keys when the power operatedI carriage return mechanism is actuated.

Another object of my invention is to provide means for preventing an actuation of the power operated carriage return mechanism in the event that an operator has depressedand maintains depressed a numeral key.

A still further object of the invention is to pro- .vide automatically operating means for locking and maintaining the machine locked against operation in the event that the operator has failed to properly condition certain of the work sheet controlling means before attempting to operate the machine.

Another object of the invention is to provide a key` locking means for locking the remaining computing keys against actuation when any one of them is operated, and to eiect a control of this same locking means from the power actuated elements, from the motor control switch, from the tabulator mechanism, from the power actuated carriage return mechanism and from the work sheet controlling' means, as above indicated.

Another object of my invention is to provide means whereby either l0 and 11 pence may be written and computed at a single operation of a key.

To the above and other ends which will hereinafter appear my invention consists in the features of construction, arrangements of parts and combinations of devices set forth in the following description and particularly pointed out in the appended claims.

In the accompanying drawings wherein like reference characters indicate corresponding parts in the different views- Fig. 1 is a fragmentary, vertical, fore and aft sectional view showing the forward portion of the Remington electrified bookkeeping machine equipped with the devices of my present invention.

Fig. 2 is a like view of the rear portion of the machine. I

Fig. 3 is an enlarged, detail, fragmentary, vertical, fore and ,aft section view showing the key locking means and some of the associated parts.

Fig. 4 is an enlarged, detail, fragmentary, perspective view disclosing some of the parts illustrated in Fig. 3.

Fig. 5 is a fragmentary, detail, top plan view with parts broken away, of the key locking means and some of the associated parts.

Fig. 6 is an enlarged, detail, fragmentary, vertical, sectional view of a portion of the same taken on the line 6 6 of Fig. 5 and looking in the direction ofthe arrows at said line.

Fig. '7 is an enlarged, detail, transverse, sectional view of apart of the control mechanism for the key locking means; the section being taken on the line 7-7 of Fig. 8 and looking in the direction of the arrows at said line. 9

Fig. 8 is an enlarged, detail, side elevation of the same.

Fig. 9 is a "detail, perspective view of certain of the controlling means for the key locking means and some of the associated parts.

Fig. 10 is a fragmentary, diagrammatic, side view of a portion of the machine showing the motor and the driving connections with different parts of the machine'. y

I have embodied my invention in the present 105. instance in a Remington electrified bookkeeping machine such as is disclosed in my application Serial No. 510,941, led Jan. 24, 1931, and while the present invention may be regarded as an improvement on such machine, it should be underno with its corner posts la, top plate 3,

stood that the invention is not restricted to embodiment therein but may be included in computing or combined typewriting and computing machines generally, wherever found available.

In the accompanying drawings I have shown only so much of the Remington electrified bookkeeping machine as is necessary to disclose my invention in its embodiment therein.

In the present instance I have shown the machine equipped with the carriage return mechanism actuated by a constantly running motor as disclosed in my application Serial No. 538,725, filed May 20, 1931.

It is one of the objects of this invention to provide means for automatically locking against operation the keys which' initiate the actuation of the computing mechanism and numeral printing type bars under the following conditions, and in the present construction the same locking means are effective in each instance:

(a) All of the remaining-keys of the character specified are locked against actuation when any one of them is operated.

(b) Any of such keys is locked against operation in the event that its attempted actuation is so rapidly repeated that the parts whose motion' is initiated by the first actuation thereof have not had time to complete the functions required of them before a second operation of the same key is attempted. Y

(c) All of said keys, except possibly the one which has been operated, are locked against actuation until the power controlled means associated with such actuated key have approximately completed their movement or cycle.

(d) All of said keys are locked against actuation in the event that thetabulator mechanism has been actuated and has not returned to normal ineffective position when an attempt is made to operate one of said keys.

(e) All of said keys are locked against actuation when the power operated carriage return mechanism is in operation.

v(f) All of said keys are locked against actuation when certain of the paper controlling means have not been properly conditioned and would, for example, interfere with and prevent a printing operation and possibly result in iniuri7 to the machine.

(g) All of said keys are locked against actuation when the switch by which the motor is controlled is shifted to cut on the motor, thereby preventing a false actuation or improper conditioning of the parts when the machine is not in condition to function properly.

The mechanism as a whole is preferably included in two units, in one of which the parts are carried by a frame 1 that is the same as the frame of the No. 23 Remington accounting machine etc., whereas the parts of the other unit are carried by a second frame 2 that constitutes a base on which the frame f1 rests and to which it is pivotally and detachably united. The coacting working parts carried by the two frames 1 and 2 are so related that the upper frame 1 may be swung on the base 2 and .maintained in the swung back position in order togive access to the parts contained within the frame 1 at the lower portion thereof and also to give access to underlying parts contained within the base 2. When the frame 1 is again lowered on the base frame 2 the said coacting parts on the 'two frames will be brought into cooperative relation ready to function.

In the'machine as shown, various driving devices are employed which are driven from a constantly running electric motor '7, illustrated in Fig. 10. The motor is detachably secured to a bracket 8 which in turn is detachably secured to the frame 2 at the rear thereof. The driving devices in question include a toothed bearing snatch roll 9 fixedly mounted to turn with a motor driven shaft 10 and a series of independently operable controlling cams or power actuated elements 12 loosely mounted with the aid of ball bearings on, but adapted to be selectively coupled with, a motor driven shaft 13, as will hereinafter more clearly appear. The shafts l0 and 13 are preferably mounted on the ball bearings and at the righthand side of the machine said shafts extend beyond the 4frame 2 where they are provided with driving pulleys 14 and 15. A worm gear 16 (Fig. 5) is xed on the shaft 13 and meshes with a worm pinion 17 on a short driving shaft 18 mounted to turn in a bearing in the base frame 2. The outer end of this shaft carries a driving pulley 19 from which motion is transmitted to the shaft 13. The motor shaft 20 carries a driving pulley 2l over which a driving belt 22 passes to' the pulley 19 and thence to a driving pulley 23 supported on a rear corner post 1a of the frame 1 to operate the carriage return mechanism, as will hereinafter appear. The belt 22 in passing from the pulley 21 to the pulley 19 coacts with a take-up pulley 24 mounted on an arm 25, pivoted at 26 to a bracket arm 27 fixed to the frame 2. This arm is pressed upward by a spring 28 to take up any slack in the driving belt 22.

The pulleys 14 and 15 are connected by driving belt 29 that receives downward pressure from a take-up pulley 39 mounted on an arm 40 pivoted at 41 on the side of the frame 2 and pressed downward by a spring 42 totake up slack in belt 29. Motion is ths transmitted from the motor shaft to the cam shaft 13 and from the latter to the snatch roll 9 so that they operate in unison but at the proper ratio, the shaft 13 turning-at, say, two and one half times the speed of the snatch roll shaft l0 in the present instance.

In order to provide a protection against the operator coming into contact with the motor and driving mechanism described above, which is outside of the frames 1 and 2, I prefer to employ a housing 43 which entirely encloses said parts and is shown in section in Fig. 10. This housing is detachably connected tothe frames l and 2 and when employed must first be removed before the frame 1 and the parts carried thereby can be swung back on or detached from the lower or base frame 2. It also is necessary or advisable to first remove the belt 22 from the pulley 23.

Of course it will be understood that so far as the features of my present invention to be hereinafter described are concerned, the separable or detachable units and the housing hereinbefore describedmay or may not be employed.

Control of the alphabet printing instrummtalitz'es The snatch roll 9 is provided with teeth 9a which extend throughout the length thereof from side. to side of the base frame 2. This snatch roll is provided to operate on connections by which the alphabet printing instrumentalities alone are actuated, the numeral type bars and the computing mechanism being controlled from the cams l2 as will presently appear; such cams having no control of the alphabet printing type bars. I will rst describe the manner of operating the alphabet printing type bars from the snatch roll 9.

Referringy more particularly to Fig. l it will be seen that substantially horizontally disposed alphabet key levers 44 extend infore and aft, vertical, parallel planes and are all fulcrumed at their rear ends on a common'fulcrum bar 45 carried by the frame 1; a contractile returning spring 46 being connected to each of said key levers.

Each key lever 44 carries a depending arm 48 that terminates in' a laterally extending lug 49. Each of said lugs coacts with an angular tripcarrying lever 52 mounted to turn on a xed pivot rod 53. Each lever 52 is connected at one end to a contractile returning spring 54 connected at its opposite end to a fixed sheet metal channel bar 55. y Pivoted at 58 to each lever 52'is a trip pawl 59 provided with a hook-like end 62 and connected by a spring 63 with the companion carrying lever 52. The hook-like end 62 of each trip pawl coacts with an upwardly extending projection 64 on a companion engaging or actuating Ipawl 65. Each pawl 65 is pivoted at 66 on the depending forward end portion 67 of a substantially horizontally disposed type bar actuating lever 68 parallel with and interspersed between the key levers 44. 'I'here is'one lever 68 for each alphabet key lever, and they are all fulcrumed on the common fulcrum bar 45 in the rear of the machine, each lever 68 being connected to a returning spring 69. Each of the levers 68 is provided witha depending projection 71 which coacts with the universal bar 72 mounted and functioning in the usual manner to actuate the ribbon vibrator and interpose the ribbon in the path of a type bar as the latter approaches the printing position. Such ribbon controlled mechanism may be the same as that usually employed in different standard Remington machines and which will be hereinafter referred to more in detail.

Each pawl 65 is provided'with a spring 76 that tends to disengage it from the snatch roll 9. Each of said springs 76 is connected at one end to a pawl 65y and passes through an opening 67a 'to the opposite side of the companion part 67 where the other end of the spring is secured. The lower end of each engaging pawl is guided in a slot of a guide comb 77 secured at its ends todepending arms of the brackets 51. Y

Referring to Fig. 1 it will be seen that each of the levers 68 carries an upwardly extending projection 78 that carries a pin 79. Said pin operates in the usual manner in a slot 80 of a sublever 81 pivoted at 82 and operatively connected at its upper end with an alphabet printing type bar 83. All of the type bars are pivoted, as indicated at 84, on a type bar segment 85 in order to swing upward and rearward to theprinting 'point andlmake an imprint against the platen 86 or the paper thereon through the usual ribbon (not shown). As each type bar approaches the printing position, a contact 87 thereon coacts with the universal bar 88 to move the latter and control the escapement mechanism to effect a letter space movement of the carriage 89 and the platen 86 carried thereby.

So much of the type actions as includes the sub-levers 81, the type bars and the manner of mounting the same, the carriage construction, the carriage feed mechanism, the ribbon control mechanism, etc., are or may be of the usual construction employed in standard Remington machines. Y

The eiect of depressing an alphabet key from the normal Fig. 1 position, is to turn the associated lever 52 in an anti-clockwise direction on its pivot 53 until said lever is arrested by an adjustable screw stop 52. This results in throw- 'ing the engaging portion 75 of the companion pawl 65 into the path of the teeth 9a of the constantly running snatch roll 9. When the pawl :65 is thus engaged by the snatch roll, it will be `carried down, thereby actuating the companion lever 68, sub-lever 81 and type bar 83. The parts will continue with this movement until the type bar is positively moved to a distance of about one and one quarter inches from the platen when the pawl 65 will be disengaged from the snatch roll and the type bar will continue its movement to the printing position by its own momentum and that of the 'parts connected therewith.

4When a pawl 65 is engaged by the snatch roll, it

The computing mechanism and control thereof and the numeral printing instrumentalz'ties The operation of the computing mechanism and the numeral printing type bars will now be described, it being understood from what has been said above that the alphabet printing type bars are actuated without having' any eect on the computing mechanism.

It has been explained that the actuation of the computing mechanism and the numeral printing type bars is under control of the power driven cams 12. Each of these cams is mounted on ball bearings and adjacent to each cam is arranged a locking or driving wheel 96, the hub 97 of which is xed to the driving shaft 13 by a pin 98. As shown in Fig. 3 the ends of the teeth 99 of each locking wheel 96 are preferably flat and they are separated interdental spaces 100 having substantially parallel side walls. Pivoted at 101 on one side of each of the cams 12 is a locking pawl 102 that has a squared engaging nose 103 that nts in any of the spaces 100 of the companion locking wheel and effectively locks the associated cam.

to said wheel to turn therewith and with the shaft 13 that carries it. A spring 104 is connected to each locking pawl 102 and exerts its force to move the engaging nose of the pawl towards the associated locking wheel and into one of the spaces 100 thereof.

Means are provided whereby at each depression of a numeral printing key the corresponding cam 12 will be locked to turn with the shaft 13, as above described, but for a single revolution only of the cam and the latter will then be automatically released. Such means will now be described.

It will be seen that each pawl 102 has a projection 105 that in the normal position of the parts, shown in Fig. '3, coacts with an oir-set engaging lug 106 on a trip lever 107 to hold the associated pawl l02 against the force of its spring 104 and disengaged from the companion locking wheel 96. Each lever 107 is pivoted at 108 on a hanger arm 109 secured to a cross bar 110 guide comb 115 which is secured by screws 118 to the cross bar 110.

Reverting again for a moment to the trip levers 107, it will be seen from Fig. 3 that an upwardly and forwardly extending arm 125 on each of them has a shoulder or engaging portion 126 adapted to be engaged by a laterally projecting lug 127 on a depending arm 128. 'I'his is in order to shift the companion trip lever 107 to ineffective position and free the associated pawl 102. This enables the pawl 102 to lock its cam 12 to the companion locking wheel 96 during a period of one revolution only of said wheel, as will hereinafter appear. The upwardly extending end portion 125a on each arm 125 prevents the associated lug 127 from moving rearward of the companion arm 125 and aids in bringing the members 127 and 126 in proper correlation when the frame 1 is swung down on the frame 2 from a swung back position.

Each of the arms 128 is pivoted at 129 to its associated key lever 130. The key levers 130 are provided with keys 130a and are those which control the printing of the numerals and the actuation of the computing mechanism. Such levers 130 correspond to the key levers 44 except that the former are devoid of arms 48 and are provided with the pivoted arms 128. The key leversl 130 are interspersed among the levers 44 and 68 in a like parallel arrangement and are fulcrumed on the common fulcrum bar 45 and are provided with returning springs like the springs 46. Associated with each key lever 130 and arranged adjacent thereto and parallel therewith is a lever 131 fulcrumed on the bar 45 and provided'with a depending portion 132 (Fig. l) slotted at 133 to receive a pin 1343 projecting laterally from a companion lever 134. Such levers 134 are pivoted intermediate their ends in parallel arrangement on a pivot rod 135 and are spaced apart thereon by suitable spacing sleeves.

The levers 134 are power actuated under control of the cams 12 in a manner which will be presently explained, land each companion lever 131 is connected to a numeral printing type bar in the same manner as the alphabet printing type bars are connected to their actuating levers 68. Thus, by referring to Fig. 1 it will be seen that each lever 131 has an upwardly extending projection 137 provided with a laterally extending pin, like the pin 79 that engages in a slot in an angular sub-lever 140 connected to the companion type bar in the manner hereinbefore described.

Referring once more to the trip levers 107 `land the manner of controlling them and the control of the pawls 102 thereby, it will be seen by reference to Fig. 3 that the upper end of each of the arms 128 is connected to one end of a contractile spring 128a connected at its opposite end to a pin 141 on the associated key lever 130. The force of each of these springs 128 is exerted to normally hold the companion arm 128 against a stop pin 142 carried by the associated key lever.

As a lever 130 is depressed, it results in turning the companion lever 107 in an anti-clockwise direction (as the parts appear in Fig. 3) until the latter is arrested by a stop pin 143 on the associated hanger arm 109, and the pawl 102 which was held by said lever 107 has been released. At about this time the parts assume such a position that the lug 127,0n the arm 128 will slip oi and disengage the shoulder 126 of the actuating lever 107, thereby releasing the latter from control of the depressed key lever 130 and permitting an independent return of the lever 107 to normal position under the force of its spring 116. As soon as the pawl 102 has been released in the manner described, the projection 105 thereon will drop to a position where the lug 106 cannot return to the front of said projection even in the event that the nose 103 of the locking pawl drops on top of a tooth 99 of the companion locking wheel instead of in an interdental space 100 therein. When the locking pawl 102 effects a locking engagement with its rotating locking wheel 96, the companion cam 12 will be locked to rotate with said locking wheel and the driving shaft 13 on which it is mounted. This results in carrying the pawl 102 around with the locked cam and carrying it in an anti-clockwise direction away from the'actuated lever 107 which is immediately returned to normal position prepared to coact With the projection 105 and release locked pawl from its locking wheel 96 when the latter completes one revolution. The parts will then again be in the Fig. 3 position assuming the depressed key lever 130 has been released by the operator. However, should the operator hold the key 130e depressed, the actuated lever 107 will nevertheless have returned independently thereof to normal position to coact with the projection 105 of the companion pawl and release it; the parts at such time, other than the depressed key and the parts carried thereby, being in the Fig. 3 position.

ssl

It follows from what has been pointed out f above that each depression of a numeral printing key 130a will result in a single revolution only of the associated cam 12 from the power driven shaft 13 'even though the actuated key be held depressed by the operator. From what follows it will be understood that it is necessary for the operator to permit the return of the depressed key substantially to its normal position before the same key can again be actuated to effect another revolution of its associated cam although the extent of such return movement is not very great.

Having described the manner in which the cams 12 are selectively. driven from the power shaft 13, I will next describe how motion is positively transmitted from said cams to the numeral printing type bars.

There is provided a series of oscillatory actuating members 144 (Fig. 3) corresponding to the number of cams 12 employed of which there are, in the present instance, twelve, lone for each of the numeral printing type bars 0 to 9 inclusive and two for the 10 and 11' pence printing type bars when the machine is equipped for writing and computing English money.

It may be vhere explained that in accordance with the present invention there is provided two special numeral printing type bars one having a logotype type for printing 10 pence at a single operation and the other having a logotype type for printing 11 pence at a single operation. The usual Remington totalizers (190) when constructed in the ordinary manner for computing English money readily lend themselves to computing either ten or eleven pence when introduced therein at a single operation. It follows, therefore, that either of such items may be properly set up in a totalizer and a printing thereof effected at a single operation of the appropriate 10 or 11 pence key. In this manner either of these items may be computed and printed by the operation of a single key instead of by the successive operation of two keys, as was customary heretofore.

Each of the actuating members 144. is in the nature of a lever or arm pivoted to turn loosely on the xed pivot rod mounted at its ends in brackets 146 and spaced apart on the pivot rod by spacing sleeves 147, each xedly attached to the pivot rod by a set screw 148. Each member 144 carries' a roller 149 pivotally supported on one side thereof and on the opposite side is supported a peripherally grooved member or roller 155. Each of the members 144 is equipped with such rollers 149 and 155, the former as previously pointed out bearing against its associated cam, whereas each roller provides a bearing for one end portion 157a of a heavy spring 157. The opposite end portion 158 oi each of said springs bears against a cross bar 159 secured at its ends to the frame 1. The portion'of each spring 157 intermediate its ends is coiled around the companion spacing sleeve 147 on the pivot rod 145. The force of each of `these springs is exerted downward on the companion member 144, the movement of such member under the force applied by its spring being resisted by the associated cam 12. The power of each spring 157 is sufcient to actuate the computing mechanism as will presently appear, whereas such force Vis not required to actuate the companion numeral printing type bar, the latter being positively actuated by the companion cam 12 in returning the associated arm 144 to normal position against the force of its spring 157, as will presently more clearly appear.

Each member 144 extends forward of the pivot rod 145 on which it is mounted to provide a holding or tripping arm 160 which is adapted to cooperate with the companion depending arm 128. The purpose or this cooperation between each `holding arm 160 and its companion arm 128 is to` hold the latter against return movement in cooperative relation with its trip lever 107 until the companion cam 12 has about completed its cycle. Thus, as the released cani l2 starts to turn from its normal position, it will permit its arm 144 to be lowered under the force of the companion spring 157 exerted thereon. As the low portion of the cam is4 approached, the arm 160 will move into cooperative relation with and prevent a rearward movement of the companion arm 128, and will remain in some such obstructing position substantially until the cam 12 has completed its revolution and the arm has been returned to normal position, shown in' Fig. 3. This insures a kicking and holding oil of the arm 128 from its trip lever 125 to enable the latter to be immediately returned to a position where it will coact with and release the locking pawl 102 as the latter is carried around with the companion cam, and thu-s prevent reengagement of the arm 128 with its trip lever until the cycle of operations that results from a single revolution of the cam 12 has been completed.

It has been explained that the actuation of a numeral printing type bar does not take place 'until after the completion of the computing operation and during the return movement of the associated arm 144 under'control of its cam 12. While out of order in the successive operations of the parts I preferat this point to describe the remainder of the means for effecting such numeral printing because of its simplicity and the little that need be added to what has been hereinbefore described. .l It will be seen that each member 144 at its free end has an enlarged portion 144 to which a one way trip lever 161 is pivoted at 162. This trip lever may carry any anti-friction roller 163 at the upper end thereof for cooperation with its companion actuating lever 134 by which the corresponding type action is controlled, as hereinbefore described. A block 164 on the left-hand side of each arm 144 is riveted thereto at 165 and is tapped to receive an adjustable screw stop 166, the upper end of which coacts with an edge 167 of the companion trip lever 161 to limit its motion around its pivot 162 in one direction. A contractile spring 1,68 is connected at one end to each lever 161 and normally ymaintains its trip lever at the limit of its pivotal movement in one direction, as indicated in Fig. 3. As the arm 144 descends the roller 163 will bear against the rounded end of the companion actuating lever 134 and the trip lever 161 will be moved against the force of its spring 168 until the roller 163 passes the end of the associated lever 134 without actuating it. When the depressed arm 144 reaches the lowermost position, the trip lever 161 will be moved by its spring 168 to a position where the roller 163 impinges against the under side of the forward end of the cooperative actuating lever 134. At this time the trip lever 161 bears against its screw stop 166, and on an elevation of the arm 144 to the Fig. 3 position by the positive operation of the companion cam 12 thereon, the companion actuating lever 184 will be operated to actuate the corresponding type bar. The positive actuation of the type bar continues until it has been moved about two thirds of the distance to which it has to travel to the printing position, when the roller 163 is released from contact with the companion lever 134 and the type bar continues its movement to printing position by its own momentum and that of the actuating parts connected therewith. The arm 144 and the trip lever 161 will continue their return movement to normal position under the further movement of the companion cam 12 and will be ready to again actuate the type bar when the latter and the parts connected therewith have been returned to normal position, but always on the return movement only of the associated actuating member 144 to normal position.

I will now describe the means whereby the computing mechanism is actuated by the actuating 125 members 144 under the force or" the springs 157 exerted thereon and under control of the cams 12.

As shown in Fig. 1 there is provided a series of computing mechanism actuator arms 169, one for each of the members 144 employed.` The arms 13@ 169 are loosely mounted on a pivot rod 170 secured to the frame 1. Each arm 169 is connected by a link 172 with the companion actuating member 144. prefer to.' employ any suitable resilient connection between each pair of members 144 1% and 169 that will positively transmit a downward movement from the former to the latter, but will provide a cushioning or resilient connection between the two in the transmission of an upward icc or return movement to each arm 169 from its 14o.

companion member 144.

For the attainment of this end in the present instance there is providedthe following construction.

it will be seen that each of the links 172 is bifurcated at its lower end, the armsof the bifurcated portion of the link being on opposite sides of the companion actuating member 144. These arms 0f each link are united by a pin y173 that passes 150 Referring more particularlyv to Figs. 1 and 3 145y through an upright slot 174 inthe associated member 144, such slots being of appropriate length to attain the ends for which they are provided. The link 172 is spring pressed upward by a lever 175 that bears against the lower end of one of the arms of the link and causes the pin 173 to be normally seated against the upper end wall of a slot 174. Each lever 175 is pivoted at 176 on a side of the associated member 144. One end of the associated spring l168 is connected to an arm 177 on the companion lever 175.

Ihis construction is such that eaclr member 144 in its downward motion under the force of its spring 157 will positively actuate its companion arm 169. However, if in the upward return movement of any of the members 144 under the positive` action of its cam 12, the companion arm 169 should for any reason have any undue resistance exerted against it or become locked or `blocked against return movement before the high portion of its cam 12 has been reached, then the companion slot 174 will enable the rear end of the member 144 to be moved upward without transmitting any movement to its companion link 172. At such time the associated lever 175 will be turned on its pivot 176 -against the force of its spring 168. .When the obstruction to the return movement of the link 172 is removed, the normal relation between the link 172 and its member 144 will be again established by the spring 168. This resilient connection between each arm 144 and the companion link 172 may if desired be eliminated and 'a positive connection between such parts be employed instead.

Connection between each of the arms 169 and the computing mechanism is effected by a series of upstanding links 179, one of them connected to each arm 169. These links 179 may be said to correspond to the, usual key actuated links employed in the No. 23 Remington accounting machine. The computing mechanism employed in the present instance is, or may be, the same as that employed in said machine except in the few particulars to be hereinafter specifically mentioned.

Referring particularly to Fig. 1 it will be see that each link 179 is connected at its upper end to a so-called fan 180 the latter being connected in the usual manner through a pin and slot connection 189B, 180b with a gooseneck 189. These fans are of the ordinary construction except that they are devoid of the usual sets of teeth for cooperation with the full stroke devices, and except for further slight changes` that will be pointed out. Each fan 180 has a cam 182 and coacts in the usual manner with the universal bar (not shown) to bring about the preliminary operations of the actuator before an end of the slot.lb reaches the pin 189a andpicks up the companion gooseneck 189 to operate the computing mechanism and set up the amount in a total'zer 190 in the computing zone. Except as indicated, this construction may be the same as that disclosed in the Wahl Patent No. 1,270,471, dated Jan. 15, 1918, and further detailed description thereof is deemed unnecessary.

The power actuated carriage return mechanism It has been pointed out that the driving belt 22 (Fig. l0) transmits power from the motor' the frame l.

725 and sucient of which is shown herein to arrive at an understanding of the features of the present invention in combination therewith.

The pulley 23 is xed on avshaft 209 mounted in a bearing in one of the rear corner posts 1a of (Fig. 2) fixed to turn therewith but free to slide thereon by the pins 211 fixed to the shaft and received in slots 212 in the clutch member. The

clutch member 210 by its sliding movement on the shaft 209 is thrown into and out of engagement with a second clutch member (not shown) The shaft 209 carries a clutch 210 mounted on a second shaft that lcarries a worm pinion 213, shown in dotted lines in Fig. 2. This pinion meshes with a worm wheel 214 loosely mounted on a vertically disposed shaft 215. The worm gear 214 carries a clutch section 216 with which a sliding clutch section 217 coacts. The section 217 is' fixed to turn with but is free to slide along the shaft 215 into and out of clutching engagement with its companion clutch section 216. The sliding clutch section 210 is controlled by a clutch shifting angular lever 218, whereas the sliding clutch section 216 is4 controlled byv a clutch shifting arm 219. One arm of the angular lever 218 is operatively connected to a crank arm 220 fixed on the usual main control shaft 221. The arm 219 also is fixed on said control shaft, so that a rocking of the shaft clockwise under. the power of a spring221 (Fig. 9) closes both clutches and the rocking of the control shaft in the opposite direction opens both clutches. The upright shaft 215 is in geared connection with the carriage, so `that when both clutches described above are closed by a rocking of the control shaft 221, the carriage will be returned. The control of the shaft 221 is effected in the usual manner employed in the No. 23 Remington accounting machine and substantially as indicated in my Patent No. 1,567,590, dated Dec. 29, 1925, and includes a releasing hook 222, a cooperative releasable holding latch 223, and an arm 224 with'which said latch coacts. The arm 224 is connected with and controls the rocking of the control shaft 221 to clutch opening and closing positions.

ln accordance with the present invention operative connections are provided between the power actuated carriage return mechanism and the key locking means for the numeral keys. However, before describing such connections it is ndeemed advisable to describe the remaining features of the machine which coact with the key locking means and finally describe the key locking means and the operative connections between the various features by which the key locking means are controlled.

Talrulatotr mechanism of each of these push links is connected to and g ,supported by an uprightlever 258 fulcrumed at its lower end at 259 and cooperative at-its upper end with a slide 260.` The slides are supported for individual fore and aft sliding movement on two supporting rods 261 and each coacts at its rear end with the lower end ofA a denominational stop lever 262 pivoted intermediate its ends at 263 in the tabulator frame. The upper end of each lever 262 extends forward to provide a denominational stop 264 adapted to be projected forward into the path of the rst on-coming effective column stop 265 on the carriage when the associated key 255 is depressed. On the release of said key after the carriage has been ar-A rested by the projected denominational stop, the depressed key and the parts connected therewith will be returned to normal position by the associated returning springs 266 and 266e.

The manner in which an actuation of any one of the tabulator keys 255 will not only result in Aoperating the tabulator but will also insure a re- 271 that is received in a slot 272 in the upper end of a link 273. The.) result of effecting a downward motion 'of the link 273 by an actuation of a tabulator key is to release the carriage from control of its escapement mechanism and effect a disengagement of both of thecarriage return clutches if they should be engaged at this time and bring about a locking of the computing keys. Thus, the lower end of the link 273 is pivotally connected to a crank arm-274 adjustably fixed on a rock shaft 275 which extends across the machine and is pivotally supported at its ends in the upper frame 1. This rock shaft carries a second crank arm 276 to the free end of which is pivoted an upright link 277. An upper rearwardly extending branch 278 of this link is pivoted at 279 to a two part rack releasing device comprising two members 280 and 281 adjustably united and pivoted at 282 on' a bracket that extends from the top plate 3 of the machine. A

` rack lifting shoe 283 on the member 281 underlies the usual feed rack 284 -pivotally supported on the carriage and normally engaging the usual feed. pinion 285 of the carriage escapement mechanism. Y

As will be understood from a consideration' of Fig. 2 the projection of a denominational stop clutches are engaged, thus releasing both clutches and rendering the power actuated carriage return mechanism ineffective to return the carriage even though the continuously running motor is in operation.

The rocking motion thus transmitted to the rock shaft 275 also will be transmitted therefrom to the key locking means in a marmer which will hereinafter appear.

Motor switch AThere is provided a switch by which the electric motor is energized 4or cut on" from its source of power at the will of the operator. In the present instance such switch, which is shown in Figs. 5 and 6, comprises a hand controlled member 289 pvoted at 290 in a bushing 291 secured to the housing 43 at the right-hand side of the machine. This bushing secures an index plate 292 on the upper side of the housing, such index plate having the words On and Ofi inscribed thereon at opposite sides ofthe upwardly extending arm of the hand controlled member 289. The member 289 controls a suitable switch -by which the motor 7 is controlled. In the present instance the switch is constructed and controlled as follows: A nut 293 screwed onto the bushing 291 clamps a supporting plate or bracket 22%L to the under side of the housing 43. Arms on this bracket are slotted to receive and support a slide 295 in an opening in which the lower end of the hand controlled member 289 is received. A second opening in the slide 295 receives the upper end of a switch controlling member 296 pivoteol at 297' and constructed and mounted like the member 289, except that the member 296 receives its support on a downwardly and forwardly extending arm on the bracket 294.' The lower rounded end of the switch controlling member 296 is seated in a socket 298 that receives a sliding movement on a stem 299 of an oscillatory memberprovidecl with an insulating shoe 300. Said shoe coacts with a switch roller 301 mounted to travel back and forth on the track 'way 302 of insulating material from the full tothe dotted line position shown in Fig. 6, and vice versa. A coiled expansion spring 303 surrounds' the stem 299 and causes the members 296 and 299-306 to complete their movements past the dead center and acts as a detent spring to lhold the parts of the switch in either the On or Off position to which they may be shifted. When the switch is in the On position, shown in full lines in Fig. 6, the roller 301 coacts with and. bridges the source of power to the motor.

118 1 prefer to employ av link 305 connected at one end to the bracket 29d through the bushing which supports the member 296, and connected at the other end by a screw 306 (Fig. 5) to the housing 43, or other xed point. Ilhis prevents' the bracket 294 and the parts carried thereby from turning on the bushing 291 by which they are supported. y

' The 'lowerxend of the slide 295 is notched at 307 in one side edge thereof to reeeivelan upwardly extending pinJ 308 on a lever 309 pivoted at 310 intermediate itsends on an arm 311 that extends from the bracket 294. The left-hand end of the lever 309 carries a depending pin 312 which coacts with an arm of a second lever 313 pivoted at 3111.011 the lower frame 2 of the machine. A forwardly projecting arm 315 on the lever 313 rests on and is supported and guided by the trame 2, whereas a third arm 316 on the lever 313 coacts with means to be hereinafter described for controlling the key locking means, so that such means will be shifted to lock the keys against depression when the switch is shifted to the "O position; as will presently appear.

Work sheet controlling means The" Remington electrified bookkeeping machine is provided with so-calledfront feed devices includingr a deflector 317 'to facilitate the introduction of work sheets 4from the front of the machine rearward and downward beneath the platen and to collate such work sheets in the machine with the further aid of feed rollers by which the sheets are held in position and fed together after they have been collated. One form of such mechanism is disclosed in the patent ,to S. L. Walsoe, 1,663,362, dated March 20, 1928. Such mechanism includes a work sheet deector 317 that is movable from an ineiectivevposition shown in Fig. 2, where it is out of the path of all of the type bars, to an effective position where it crosses the printing line and is in the path of the type bars. kShould the operator forget to recondition the machine ready for writing after collating the work sheets, the deflector 317 willI remain in the path of the type bars. Should the numeral type bars be operated at this time, it would result in setting up the items in the totalizer but no corresponding numerals would be written on the work sheet. Moreover an attempted actuation of the type bars at this time would be liable to result in breaking or mutilating the actuated type bars, or the work sheet deflector 317, or both. It is one of the purposes of the present invention to effect a control of the key locking means by an actuation of the paper controlling devices so that should the operator neglect to properly condition such devicesbefore actuating the combined computing and type- Writing mechanism, the keys thereof will be locked and prevent such actuation until the work sheet controlling devices have been properly conditioned.

The work sheet controlling means in question will now be briefly described. Referring more particularly to Figs. 1 and 2 it will be understood that terminal feed rollers 318 are mounted on the carriage for movement fore and aft of the machine out of and into contact with the platen 86 under control of toggle members 319 and 320. The construction is such that when said feed rollers are withdrawn from the platen a forward movement of two controlling arms 321 around the axis of a shaft 322 on which they are xedly mounted will be produced, the shaft being supported for rocking movement on the carriage. A line indicating wire 323 is stretched around its pivotal center 327 bringing the lower end thereof substantially into alignment with the forward end of a curveddeector 328 arranged beneath the platen. This provides means which facilitate a rearward introduction of a work sheet through a channel 329 (Fig. 2) between the curved deector 328 and a second curved deflector 330 arranged above and connected with the deector 328. The same forward movement of the arms 321 results in moving down a plate 331 secured to the rock shaft 322 and extending substantially throughout the width of the carriage. This plate carries a down turned contact edge'332 that overlies a roller 333. Said roller is carried by a bracket arm 334 supported on the vertical movable frame 335 supported on parallel links 336 and by which the ribbon vibrator 337 is supported; the vibrator being operated in the usual manner from the universal bar 72. The frame 335 and vibrator control mechanism are the same as those employed in standard Remington machines, and are much the same as theA corresponding features disclosed in the patent to John H. Barr, No. 1,153,668, dated Sept. 14, 1915. Ordinarily in standard Remington machinesl the frame 335 is caused to follow up the platen when the latter is shifted for upper case writing. However, there is no case shifting movement of the platen in Remington front. feed bookkeeping machines, the platen being retained in the upper case position and the shiftable frame 335, controlled by the plate 331 in the manner described, is employed to lower the vibrator 327 as the deflector 317 is being moved to effective position. The vibrator is thus lowered out of the path of said derlector as the latter moves to effective position, providing against the vibrator interfering with the movement of the deflector to effective position. In accordance with the present invention I have utilized this ydownvvar movement of the frame 335 brought labout at each movement of the deector 317 across the printing line to eiectiv'e position to operate the key locking means as will hereinafter appear.

Key locking means I will now describe the key locking means of the present invention and will thereafter describe the means by which a control thereof is effected 1 the frame 1 of the machine. These balls have ag limited movement along the channel sucient only to permit the entrance of one key lever 130 at a time through a slot 340 in the housing and between two adjacent balls 338. When this oc curs all of the remaining balls are held in close contact, the end balls contacting with the end walls 341 of the channel, thereby preventing the depression of any of the remaining key levers 130 until the actuated key lever has returned substantially to normal position. In this manner only one key lever 130 can be depressed at a time.

Control of thejcey locking means by the power 4 actuated elements In addition to performing its function as a single key lock for the foregoing purpose, I have provided means controlled by each of the power actated devices or elements by which the cornputing mechanism and numeral printing type bars are controlled for locking the keys. In the present instance Vthese power actuated elements are the cams 12 and they automatically control the key locking means to prevent an actuation of any key 1.30il after a cam 12 has once been coupled to its driving shaft 13 and for maintaining the keys locked against depression until the coupled cam has substantially completed its cycle. I will now describe such means. f

Each`cam l2 carries a pin 342 which in the present instance is formed as an extension on the screw pivot 101 byv which the associated locking pawl 102 is pivoted to its cam 12. In the normal position of the parts each pin 342 engages a cam 343 secured by screws 344 to a controlling link or slide 345 that extends fore and aft of the machine and is mounted for longitudinal sliding movement in such a direction in guide combs 346 and 347 by which the slides are supported and guided in the base' frame 2. The forward endsl of these slides rest on and are `supported by the spacing sleeves 256e by which the tabulator levers 256 are maintained spaced apart on the pivot rod 256b by which they are supported. Each slide 345 is off-set at 348 and is connected to one end of a contractile spring 349 which is anchored at its opposite end to a flange 350 that forms part of the guide comb 347 supported by bracket arms 351. The force of each spring 349 is effective to move its associated slide 345 towards the rear of the machine and actuate the parts controlled thereby when an anti-clockwise movement of the companion cam 12 releases a pin 342 carried thereby from the cam 343 carried by the associated slide. The rearward movement of each slide 345 is` limited by a shoulder or stop 352 thereon abutting the guide comb 347. The released slide will remain in its rearward position `until the moving cam 12 has almost completed its cycle and has again brought the pin 242 thereon into contact with the companion cam 343 and moved the slide on which said cam is carried forward to its original position where it is held due to the fact that the cam 12 is released from the shaft 13 and held against further movement when the cam 12 completes its cycle.

The rearward movement of each slide 245 under the direct control of its cam 12 in the manner indicated, is utilized to control the key locking means. Thus, each slide 345 has an upwardly extending arm 353 provided with a cam edge 354. Each of these arms extends up in front of a universal bar or bail 355 that is supported at its ends by arms 356`and 357 connected with the rock shaft 358. This shaft is supported in xed brackets 359 secured to the cross bar 360 by which the housing for the locking balls 338 is supported. A locking arm 361 is secured by its hub 362 to a rock shaft 358 and registers with a special slot 363 in the ball housing 339.- A spring 364 is coiled around the shaft 358, being anchored at one end against the cross bar 360^and connected at its other end to the hub 365 of a crank arm 365 secured to the shaft by a set screw. The force of the spring 364 is exerted to rock the shaft 358 clockwise as the parts are shown in Figs. 3 and 4. The effective force of the spring 364 is less, however, than that of each of the springs 349 so that when any of the slides 345 is released from its cam 343 the associated spring 349 will overcome the force of the spring 364, thereby rocking the shaft 358 in an anti-clockwise direction, as the parts are shown in Figs. 3 and 4. This results in forcing the locking arm 361 through the slot 363 and between the locking balls and will crowd the latter together and prevent a depression of anyof the computing key levers 130. It follows that as long as the locking arm 361 remains in this position none or" the computing keys can be depressed. The

locking of the keys in the manner described takes place the instant the associated cam 12 is released from control of its pin 342 on the depression of a computing key and as said cam 12 starts to move from its position of rest to control the actuation of the computing mechanism and assocated type bar. The keys will remain locked until the moving cam 12 has almost complated a single cycle, when the pin 342 carried thereby engages the cam 343 on the companion slide 345 and shifts the latter forward against the force of its spring 349. This results in releasing the rod or bail '355 and enables the spring 364 to rock the shaft 358 clockwise, as the parts appear in Figs. 3 and 4. The eect of this is to withdraw the locking or holding arm 361 from hetween adjacent locking balls 338, freeing them se as to offer no obstruction to the depression of any of the keys 130B. It will be seen that the control of the key locking means directly from the cams 12 aords a direct control of such locking means from the power actuated devices byY which the computing operations and the numeral4 Control of the key lock from the power actuated carriage return mechanism Referring to Fig. 2 it will be seen that the main control shaft 221 carries a depending crank arm 367 which at its forward edge coacts with a stud 368 carried by and swiveled on a crank arm 369. A forwardly extending push rod 370 passes freely through an opening in the stud 368 and carries a collar 371 secured to the push rod by a set screw 372. The forward end of the push rod 370 is pivotally connected to a depending lever 370a (Fig. 1) which in turn is pivotally connected at its lower end to a forwardly extending push rod or link 370". The forward end of the push rod 370b is pivotally connected to a crank arm 366v on the shaft 358, as shown in Fig. 4.

It will be understood, therefore, that when the control shaft 221 is rocked in a clockwise direction in Fig. 2, to move both clutch sections 210 and 217 and thus close the clutches to return the carriage, the arm 367 will be lmoved forward shifting the push rods 370, 370b forward. 'I'his results in rocking the shaft 358 against the force f its spring 364 and moving the locking arm 361- forward between the locking balls 338, thus locking the keys'l30a against depression until the carriage has completed its return movement. At about the time when this occurs the control shaft 221 will be rocked anti-clockwise, as the parts appear in Fig. 2, thus enabling the push rods 370, 370b to be moved rearward by the force of the spring 364, at the same time withdrawing Vthe arm 361 from between the locking balls 363,

so that the keys 130a are now free to be actuated.

Locking the carriage return mechanism against operation in the event that a numeral key is held depressed In addition to locking the keys 130e against actuation when thepower actuated carriagev return mechanism is inwoperation as described above, the mechanism providesffor automatically preventing a functioning of the carriage return mechanism as long as one of said keys is held depressed by the operator. Thus, it will be understood that should one of said keys 130L be held depressed the locking arm 361 cannot enter between the locking balls. It follows, therefore, that the links or push rods 370 and 370a are held against forward movement. This results in holding the main control shaft 221 against clockwise movement from the Fig. 2 position under the force of the spring 221a (Fig. 9) applied thereto, even if the holding pawl 223 is tripped off the arm 224. Consequently the arms 219 and 228 cannot be shifted to close the clutches and the carriage cannot be returned. As soon, howeven' as the operator releases the depressed key 130a and it returns to normal position, the locking arm 361 will enter between the balls locking the keys 130a against depression and permitting the the carriage.

Control of the key lock from the tabnlator From an inspection of Figs. 7, 8 and 9 it will be seen that the stud 368 has a reduced portion 373 loosely seated in an opening in the arm 369. A headed screw 374 is received in a tapped opening in said reduced portion 373 of thestud and the head of the screw bears against the end of said reduced portion. In this manner the stud is connected to the arm 369,'but is free-to turn thereon so that a swinging movement of the arm will not be interfered with by the push rod 370 that extends freely through the opening in the stud 368.

The lower end of the arm-369 is fixed to a rock shaft 375 with the aid of screws 37,6 that extend through tapped openings in the hub 377 of the arm and bear against opposite side walls of a V-'shaped groove in the shaft in-order that the arm may be rotatively adjusted to different fixed positions on the shaft. A spring 378 is fixed at one end, to a set screw 379 by which a collar 380 is secured to the shaft 375. The other end 'of this spring bears against the rear edge of the fulcrum plate 45, so that the spring will exert its force to turn the shaft 375' clockwise, as the parts are shown in Fig. 2. This is in order tomaintain the stud 368 against the arm 367 when the push rods 370 and 370b are moved forward independently of the stud, and the spring 364 is ineffectiveto maintain the stud in contact with the arm 367, as will presently appear. The rock shaft 375 is supported in bearings in two xed bracket arms 381 and 382 attached to the support for the fulcrum bar 4.5. Endwise displacement of the shaft 375 in its bearings is prevented by a collar 383 secured to the shaft on one side of the bracket arm 381 by a set screw 384, whereas the hub 385 of a crank arm 386 is secured to the shaft on the opposite side of the bracket 381 by screws 387. These screws bear against the opposite walls of a V-shaped groove in the shaft and provide means for giving a rotative adjustment to the arm, 386 on the shaft. A pin 388 overlies the arm 386 and is carried by a crank arm 389 adjustably attached by screws 390 to the rock shaft in the same manner that the arm 386 is attached to the rock shaft 375.

From the foregoing description of these parts, and from what has been previously said in connection with the operation ofthe tabulator mechanis'm and the control of the universal bar 267 and rack releasing means 277, it will be understood that when a tabulator key 255 is depressed to project a denominational stop 264, downward motion will be transmitted to the link 273 from said universal bar. This movement of .the link 273 is effective to rock the shaft 275 which results in rocking the shaft 375 in an anti-clockwise direction, as the parts are shown, through the coacting crank. arms 389 and 386. The result of this is to move the arm 369 forward transmitting a forward movement to the links or push rods 370 and 370b to rock the shaft 358 in an anticlockwise direction and move the arm 361 between the locking balls 338 thus locking the keys a against depression. Said keys will remain locked until the tabulating operation has been completed and the tabulator key has been released and the parts controlled thereby have returned to normal position.

It has previously been pointed out that this same operation of a tabulator key results in releasing the two shiftable carriage return clutch members 210, 217 in the event that the clutches are closed at this time, so that there can be no interference with a proper tabulating operation.

Control of the key lock from the work sheet controlling means From a consideration of Figs. 7, 8 and 9 it will be seen that the crank arm 369 carries an extension member or arm 391 that is detachable from and adjustable on the arm 369. Thus the arm 391 is secured by a clamping screw 392 to the upper end of the arm 369, the stem of said screwv passing through an enlarged opening 393 in the arm 391 to provide a limited adjustment of the extension member on the arm 369, for purposes which will presently appear.A The lower end of the member 391 is bifurcated at 394 to straddle a headed pin 395 carried by the arm 369. In order not to interfere with an adjustment of the extension 391, the head of the screw 374 is received in an enlarged opening 396 in the extension 391. By making the members 369 and 391, which constitute a crank arm, in two parts in the manner described, I not only provide for effecting a relative adjustment between the members but make provision for materially aiding in assembling the parts in the machine.

The member 391 is off-set laterally at the forward end portion thereof where it terminates in a laterally projecting flange or shoe 397 that underlies the lower end of one of the arms 398 of the ribbon vibrator support 335. It will be understood therefore that when the feed rollers 318 are moved away from the platen and the deflector 317 is moved to effective position across the printing line, the ribbon vibrator support 335 will be lowered through the action of the rock shaft -322 and the plate 331. This results in depressing the extension 391 and effecting a forward movement of the stud 368 which is transmitted to the push rods 370 and 3701 through the action of said stud on the collar 371. This movement of the push rods results in locking the balls 338 against shifting movement and preventing a depression of the keys 130e, thus preventing actuation of the computing mechanism and the numeral printing type bars and preventing not only a false operation of the machine but a possible injury to the power actuated numeral writing type bars, or the deector 317, or both. When the work sheet controlling means 317 and 318 are properly con-` ditioned by the operator as shown in Fig. 1, the key locking means will be automatically released and the operator may proceed with an actuation of the machine. l

The adjusting means for the extension 391 enables the flange 397 thereon to be brought to proper position with reference to the arm 398 that coacts therewith.

Control of the key lock from the motorv switch 'rearward This results inrocking the shaft 358 and forcing the arm 361 between the locking balls to prevent a depression of any of the keys 1303,

thereby preventing an actuation of the computing mechanism and the numeral writing type bars. These keys will remain locked as long as the motor is cut oi, but will be automatically released when the switch is shifted to energize the A motor. By these means the actuation of the keys downward movement of the companion arm 144` which would result in setting up an item in a totalizer in the computing zone, leaving the cam in this released condition. This would result in actuating the companion slide 345 bringing about an actuation of the key locking means that would prevent the subsequent operation of any of the remaining keys 130e, or a repeat operation of the same key which had been actuated. However, a false item would have been set up in the totalizerlwithout the knowledge of the operator and when the machine is next used an improper amount would be set up in the totalizer and a corresponding improper item would be printed on the work sheet. i By the control of the key locking means from the motor switch in the manner described, these diiiiculties are overcome and a false actuation of the machine inthe manner indicated cannot take place.

Referring particularly to Fig. 4 it will be seen that in the present instance the locking balls 338 are supported and roll on a metal plate 399 that overlies and is supported by a strip 400 of leather or like material. The plate 399 is slotted at 401 in register with the slots 340 so that the leather strip constitutes a stop for noiselessly arresting the depression of the key levers 130.

A convenient means for supporting the guide comb 346 is to form a slot 402 in each side of the frame 2, as shown in Fig. 4, and seating the comb therein. A headed screw 403 is received in a tapped opening in the frame at each end of the comb and the head of each screwA overlaps the comb and retains it in place.

It may be explained that in building the machine for use in computing and writing English money as illustated in the present instance, lt have elected to omit the slides 345 for the two righthand cams 12 by which the computing and writing of the 10 and 11 pence are controlled, inasmuch as a locking of the keys after an actuation of the key that controls either of said cams is unnecessary, since this is a iinal step, and no computing keys are ever actuated immediately following the computing and writing of either of such items.

It also may be explained that the cam edge 354 on each of the slides 345 enables the slides to be brought into proper correlation with the rod or bail 355 whenthe upper frame 1 is swung down into position on the base frame 2, irrespective of the positions of said slides, or bail, or both.

What l' claim as new and desire to secure by Letters Patent is:

l. rlthe combination of computing mechanism; means for controlling the actuation of said computing mechanism comprising a series of keys, and a series of Apower actuated individually operable rotative cams selectively driven in accordance with the actuation of said keys; key locking means; and means controlled by each of said cams for automatically causing said locking means to lock the keys against actuation after a cam has been set in motion and upon return or an actuated key for maintaining the keys locked until the moving cam has substantially completed its cycle.

2. The combination of computing mechanism; means for controlling the actuation of said computing mechanism comprising a series of keys and a series of individually operable power actuated operating devices selectively driven in accordance with the actuation of said keys; key locking means; automatically operating means for causing said locking means to lock the keys against actuation after any power actuated operating device hasA been set in motion and for maintaining the keys locked until such moving operatingdevice has substantially completed its cycle; power actuated carriage return mechanism; andautomatically operating means controlled by said carriage return mechanism for controlling said key locking means.

3. The combination of computing mechanism; means for controlling the actuation of said computing mechanism comprising a series of keys and l a series of individually operable power actuated operating devices selectively driven in accordance with the actuation of said keys; key locking means; automatically operating means for causing said locking means to lock the keys against actuation after any power actuated operating de vice has been set in motion and for maintaining the keys locked until such moving operating de- Vice has substantially completed its cycle; tabulator mechanism; and means under control of said tabulator mechanism for automatically controlling said key locking means.

4. The combination of computing mechanism;

means for controlling the actuation of said computing mechanism comprising a series ci keys and a series of individually voperable power actuated operating devices selectively driven in accordance with the actuation of said keys; key locking means; automatically operating means for causing said locking means to lock the keys against actuation after any power actuated operating device has been set in motion and for maintaining the keys locked until such moving operating device has substantially completed its cycle; power actuated carriage return mechanism; automatically operating means controlled by said carriage return mechanism for controlling said key locking means; tabulator mechanism; and means under control of said tabulator mechanism for automatically controlling said key locking means.

5. The combination of computing mechanism;

means for controlling the actuation of said computing mechanism comprising a series of keys and a series or" individually operable power actuated operating devices selectively driven in accordance with the actuation of said keys; key locking means; automatically operating means for causing said locking means to lock the keys against actuation after any power actuated operating device has been set in motion and for maintaining the keys locked until such moving operating device has substantially completed its cycle; a motor for furnishing the power by which said power actuated devices are operated; a switch for controlling said motor; and operative connections between said switch and said key Alocking means.

6. The combination of computing mechanism; means for controlling the actuation or" said computing mechanism comprising a series of keys and a series of individually operable power accordance with the actuation of said keys; key locking means; automatically operating means for causing said locking means to lock the `keys against actuation after any power actuated operating device has been set in motion and for maintaining the keys locked until such moving operating device has substantially completed its cycle; power actuated carriage return mechanism; automatically operating means controlled by said carriage return mechanism for controlling said key locking means; tabulator mechanism; means under I control of said tabulator mechanism for automatically controlling said key locking means; a motor for furnishing the power by which said power actuated devices are operated; a switch for controlling said motor; and, operative connections between said switch and said key locking means.A

7. In a power actuated combined typewriting and computing machine, the combination of a carriage; computing mechanism; printing instrumentalities; means for controlling the actuation of said computing mechanism and printing instrumentalities comprising a series of keys and a series of independently operable power actuated operating devices selectively driven in accordance with the actuation of said keys; single key locking means; and means controlled by an actuation ot' any of said power actuated operating devices for causing said key locking means to lock the keys against actuation upon return of an actuated key and for maintaining the keys locked until the moving operating device has substantially completed its movement.

8. In a power actuated combined typewriting l keysl locked until the moving operating device has substantially completed its movement; power actuated carriage return mechanism; and means controlled by said carriage return mechanism for controlling said key locking means, whereby the key locking means becomes eilective under any of the following conditions (1st) when any key is depressed and thereby prevents the operation of the other keys, (2nd) when a power actuated operating device is in operation and has not completed its movement, (3rd) when the carriage return mechanism is in Operation.

' 9. In a power actuated combined typewriting and computing machine, the combination of a carriage; computing mechanism; printing instrumentalitics; means for controlling .the actuation of said computing mechanism and printing instrumentalities comprising a series of keys and a series of independently operable power actuated operating devices selectivelyA driven in accordance with the actuation of said keys; single key locking means; means controlled by an actuation of any of said power actuated operating devices for causing said key locking means to lock the keys against actuation and for maintaining the keys locked until the moving operating device has substantially completed its move.- ment; a motor by which said power actuated devices are driven; a switch for said motor; and operative connections between said switch and said key locking means.

10. In a power actuated combined typewriting and computing machine; the combination of a carriage; computing mechanism; printing instrumentalities; means for controlling the actuation of said computing mechanism and printing instrumentalities comprising a series of keys and a series of independently operable power actuated operating devicesY selectively driven in accordance with the actuation of said keys; single key locking means; means controlled by an actuation of any of said power actuated operating devices for causing said key locking means to lock the keys against actuation and for maintaining the keys locked until the moving operating device has substantially completed its movement; tabulator mechanism; and means controlled by said tabulator mechanism for controlling said key locking means.

11. In a power actuated combined typewriting and computing machine, the combination of a carriage; computing mechanism; printing instrumentalities; means for controlling the actuation of said computing.mechanism and printing instrumentalities comprising a series of keys, a series of independently operable cams, a power actuated shaft, and means controlled by said keys for selectively connecting said cams to said power driven shaft to turn therewith; key locking means; and means controlled Aby each of said cams for operating said key locking means to lock the keys against actuation.

12. In a power actuated combined typewriting 110,

ing means; means controlled by each of said nu cams fo'.` controlling said key locking means; a motor by which said shaft is driven; a switch for said motor; and operative connections between saidV switch and said key locking means for controlling the latter from said switch.

13. In a power actuated combined typewriting and computing machine, the combination of a carriage; computing mechanism; printing instrumentalities; means for controlling the actuation of said computing mechanism and printing instrumentalities comprising a' series of keys, a series of independently operable cams, a power actuated shaft, and means controlled'by said keys for selectively connecting said cams to said power driven shaft to turn therewith; key locking means for locking the remaining keys against actuation when any one of them is operated; motor driven carriage return mechanism; means fo': causing said key locking means to lock the keys against operation when said carriage return mechanism is actuated; and lmeans controlled by each of said cams for causing said key locking means to lock the keys against actuationuntil the moving cam has substantially completed its cycle.

14. In a power actuated combined typewriting and computing machine, the-combination of a carriage; computing mechanism; printing instrumentalities; means for controlling the actuation of said computing mechanism and printing instrumentalities comprising a series of keys, 

